The formation of graphite upon the interaction of subducted carbonates and sulfur with metal-bearing rocks of the lithospheric mantle

Yu V. Bataleva, Yu N. Palyanov, Yu M. Borzdov, O. A. Bayukov, N. V. Sobolev

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Experimental studies of the Fe0–(Mg, Ca)CO3–S system were carried out during 18–20 h at 6.3 GPa, 900–1400°C. It is shown that the major processes resulting in the formation of free carbon include reduction of carbonates upon redox interaction with Fe0 (or Fe3C), extraction of carbon from iron carbide upon interaction with a sulfur melt/fluid, and reduction of the carbonate melt by Fe–S and Fe⎯S–C melts. Reconstruction of the processes of graphite formation indicates that carbonates and iron carbide may be potential sources of carbon under the conditions of subduction, and participation of the sulfur melt/fluid may result in the formation of mantle sulfides.

Original languageEnglish
Pages (from-to)88-91
Number of pages4
JournalDoklady Earth Sciences
Volume466
Issue number1
DOIs
Publication statusPublished - 1 Jan 2016

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